Node¶

class feastruct.fea.node.Node(coords)[source]¶

Class for a node to be used in finite element analyses.

A node object is defined by its position in 3D cartesian space and has six associated degrees of freedom.

Variables:

coords (list[float, float, float]) – Cartesian coordinates of the node

dofs (list[DoF]) – List of degrees of freedom for the node (x, y, z, rx, ry, rz)

nfs (list[bool]) – Node freedom signature

__init__(coords)[source]¶

Inits the Node class.

Parameters: coords (list[float]) – Cartesian coordinates of the node ([x], [x, y] or [x, y, z])

copy_node(vec)[source]¶

Copies and returns a new node shifted by the vector vec ([dx], [dx, dy] or [dx, dy, dz]).

Parameters: vec (list[float]) – Vector to move the current node by

Returns: New node object

Return type: Node

get_displacements(analysis_case)[source]¶

Returns the displacement vector for the current node and analysis case. If the degree of freedom is not used in the current analysis case, a None value is assigned.

Degree of freedoms are ordered as follows: (x, y, z, rx, ry, rz)

Parameters: analysis_case (AnalysisCase) – Analysis case relating to the displacement

Returns: Displacement vector of length (1 x 6)

Return type: float

get_dofs(freedom_signature)[source]¶

Returns the degree of freedom objects relating to the freedom_signature list.

Parameters: freedom_signature (list[bool]) – Degree of freedom indices to return

Returns: List containing degree of freedom objects

Return type: list[DoF]

move_node(vec)[source]¶

Moves the current node by the vector vec ([dx], [dx, dy] or [dx, dy, dz]).

Parameters: vec (list[float]) – Vector to move the current node by

DoF¶

class feastruct.fea.node.DoF(node, node_dof_num)[source]¶

Class for a degree of freedom to be used in finite element analyses.

A degree of freedom relates to a specific node and has a specific degree of freedom number used in the finite element analysis. Displacement results are stored within the degree of freedom.

Variables:

node (Node) – Parent node

node_dof_num (int) – Node degree of freedom number

global_dof_num (int) – Global degree of freedom number

displacements (list[Displacement]) – A list of Displacement objects for the dof

buckling_results (list[BucklingMode]) – A list of BucklingModes objects for the dof

frequency_results (list[FrequencyMode]) – A list of FrequencyModes objects for the dof

__init__(node, node_dof_num)[source]¶

Inits the DoF class.

Parameters: node (Node) – Parent node

get_buckling_mode(analysis_case, buckling_mode)[source]¶

Returns the value of the eigenvalue and eigenvector for a given buckling_mode related to an AnalysisCase.

Parameters:

analysis_case (AnalysisCase) – Analysis case relating to the buckling results

buckling_mode (int) – Buckling mode number

Returns:
Eigenvalue and eigenvector corresponding to an analysis_case and buckling_mode

Return type:
tuple(float, float)

Raises:
Exception – If buckling results corresponding to an analysis_case cannot be found, or if the buckling mode does not exist

get_displacement(analysis_case)[source]¶

Returns the displacement value relating to an AnalysisCase.

Parameters: analysis_case (AnalysisCase) – Analysis case relating to the displacement

Returns: Displacement value

Return type: float

Raises: Exception – If a displacement corresponding to analysis_case cannot be found

get_frequency_mode(analysis_case, frequency_mode)[source]¶

Returns the value of the eigenvalue and eigenvector for a given frequency_mode related to an AnalysisCase.

Parameters:

analysis_case (AnalysisCase) – Analysis case relating to the frequency results

frequency_mode (int) – Frequency mode number

Returns:
Eigenvalue and eigenvector corresponding to an analysis_case and frequency_mode

Return type:
tuple(float, float)

Raises:
Exception – If frequency results corresponding to an analysis_case cannot be found, or if the frequency mode does not exist

save_buckling_modes(buckling_modes, w, v, analysis_case)[source]¶

Saves buckling results to the DoF.

Parameters:

buckling_modes (list[int]) – Buckling mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the buckling analysis

save_displacement(disp, analysis_case)[source]¶

Saves a displacement result to the DoF.

Parameters:

disp (float) – Value of the displacement

analysis_case (AnalysisCase) – Analysis case relating to the displacement

save_frequency_modes(frequency_modes, w, v, analysis_case)[source]¶

Saves frequency results to the DoF.

Parameters:

frequency_modes (list[int]) – Frequency mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the frequency analysis

Displacement¶

class feastruct.fea.node.Displacement(disp, analysis_case)[source]¶

Class for storing a displacement at a degree of freedom for a specific analysis case.

Variables:

disp (float) – Displacement at a degree of freedom

analysis_case (AnalysisCase) – Analysis case relating to the displacement

__init__(disp, analysis_case)[source]¶

Inits the Displacement class.

Parameters:

disp (float) – Displacement at a degree of freedom

analysis_case (AnalysisCase) – Analysis case relating to the displacement

Buckling Modes¶

class feastruct.fea.node.BucklingModes(buckling_modes, w, v, analysis_case)[source]¶

Class for storing buckling modes at a degree of freedom for a specific analysis case.

Variables:

buckling_modes (list[int]) – Buckling mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the buckling analysis

__init__(buckling_modes, w, v, analysis_case)[source]¶

Inits the Displacement class.

Parameters:

buckling_modes (list[int]) – Buckling mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the buckling analysis

Frequency Modes¶

class feastruct.fea.node.FrequencyModes(frequency_modes, w, v, analysis_case)[source]¶

Class for storing frequency modes at a degree of freedom for a specific analysis case.

Variables:

frequency_modes (list[int]) – Frequency mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the frequency analysis

__init__(frequency_modes, w, v, analysis_case)[source]¶

Inits the Displacement class.

Parameters:

frequency_modes (list[int]) – Frequency mode numbers

w (list[float]) – Eigenvalues corresponding to the given modes

v (list[float]) – Value of the eigevectors at the DoF corresponding to the given modes

analysis_case (AnalysisCase) – Analysis case relating to the frequency analysis